In the dimly lit room, Hernán's thick cock twitches as he watches Gledy, his stepsister, dance seductively. Her dark skin glistens under the soft light, her big ass swaying hypnotically. She turns, catches him staring, and smiles mischievously. "Join me," she whispers, beckoning him. He hesitates, then gives in, his large hands gripping her hips as he enters her from behind. She gasps, then moans, her pussy stretching around his size. They move together, their bodies slapping, her ass jiggling, until they collapse in a sweaty, spent heap.